I purchased the full version. The app does have a good equalizer that makes a big difference compared to the phones built in EQ as well as spotifys. However, it makes the normal volume quieter, and you have to turn it up full blast if you like louder music. Even then I like it louder. It also seems to crash quite a bit. Biggest downfall is that you can only listen to your music saved in playlists. While you can search for music, you cant listen to your full library.
Despite the few issues, I like it :)
rissyrae89 about EQu for Spotify